Footwear having non-yellowing film

ABSTRACT

A shoe upper is non-yellowed by using a film. The film is covered on a leather. The film has the function of discoloration and has a low density.

FIELD OF THE INVENTION

The present invention relates to a footwear; more particularly, relates to a film layer adhered to a leather layer for obtaining a shoe upper with discoloration.

DESCRIPTION OF THE RELATED ART

A prior art is claimed in a US patent, U.S. Pat. No. 6,739,076, “Artificial leather shoe and artificial leather suited therefore”, comprising a shoe upper and a shoe sole. The shoe upper orderly comprises a first substrate layer, an adhesive layer and a second substrate layer. The first substrate layer comprises a first entangled nonwoven fabric and a first elastomeric polymer impregnated in the first entangled nonwoven fabric, where the first entangled nonwoven fabric comprises ultrafine fibers having a fineness of not more than 0.01 decitex. The second substrate layer comprises a second entangled nonwoven fabric and a second elastomeric polymer impregnated in the second entangled nonwoven fabric, where the second entangled nonwoven fabric comprises fibers having a fineness of not less than 0.05 decitex. The outer surface of the first substrate layer forms an exterior surface of the shoe upper. The shoe sole is fixedly bonded to a portion of the shoe upper with an adhesive. At the portion of the shoe upper that is fixedly bonded to the shoe sole, the first substrate layer and the adhesive layer have been substantially removed such that the second substrate layer is directly bonded to the shoe sole with the adhesive. The outer surface of the first substrate layer is at least a partially napped outer surface or is at least partially covered with a macromolecular elastomer. A bond peel strength of the second substrate layer is not less than 7.0 kg/25 cm. A ratio of the bond peel strength of the second substrate layer to a bond peel strength of the first substrate layer is not less than 1.5. In addition, a color difference between the first substrate layer and the adhesive layer, and a color difference between the second substrate layer and the adhesive layer, are both not less than 2.0.

Although the above prior art constructs an artificial leather shoe, the layers of the shoe upper is unstable because they are bond by using adhesive. Besides, without a protection layer on the shoe upper, the shoe upper may get dirty easily and become yellowed. Hence, the prior art does not fulfill users' requests on actual use.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to obtain a discoloration through a film layer adhered to a leather layer.

To achieve the above purpose, the present invention is a footwear having a non-yellowing film, comprising a shoe sole and a shoe upper, where the shoe upper is obtained by adhering a film layer and a leather layer through a high frequency waving; the leather layer is made of an artificial leather or a fabric; the film layer is made of a fluid-type material mixture of a Styrene-Ethylene/Butylene-Styrene (SEBS) block copolymer, a Polyolefin Elastomer (POE), an Ethylene-Vinyl Acetate (EVA) and a slip agent with different ratios; the mixture is extruded to obtain a pellet-type material; the pellet-type material is extruded through a T-die to obtain a raw material; and the film is made of the raw material through a two rolls mill. Accordingly, a novel footwear having a non-yellowing film is obtained.

BRIEF DESCRIPTIONS OF THE DRAWINGS

The present invention will be better understood from the following detailed description of the preferred embodiment according to the present invention, taken in con junction with the accompanying drawings, in which

FIG. 1A is a view showing the preferred embodiment according to the present invention;

FIG. 1B is an enlarged view showing a section of the shoe upper;

FIG. 2 is a view showing the film layer;

FIG. 3 is a view showing step (a) for making the film layer;

FIG. 4 is a view showing step (b);

FIG. 5 is a view showing step (c)

FIG. 6 is a view showing step (d);

FIG. 7 is a view showing the first structure of the shoe upper; and

FIG. 8 is a view showing the second structure of the shoe upper;

DESCRIPTION OF THE PREFERRED EMBODIMENT

The following description of the preferred embodiment is provided to understand the features and the structures of the present invention.

Please refer to FIG. 1A and FIG. 1B, which are a view showing the preferred embodiment according to the present invention and an enlarged view showing a section of the shoe upper. As shown in the figures, the present invention is a footwear having a non-yellowing film. The footwear 1 comprises a shoe sole 11 and a shoe upper 12 on the shoe sole 11, where, as shown in FIG. 2, the shoe upper 12 comprises a leather layer 121 and a film layer 122; and the leather layer 121 is made of an artificial leather or a fabric. Thus, a footwear having a non-yellowing film is obtained.

Please refer to FIG. 2, which is a view showing the film layer. As shown in the figure, the film layer 122 is obtained by mixing ingredients of a 5˜50% of Styrene-Ethylene/Butylene-Styrene (SEBS) block copolymer 1221, a 30˜80% of Polyolefin Elastomer (POE) 1222, a 5˜15% of Ethylene-Vinyl Acetate (EVA) 1223 and a slip agent 1224, where the slip agent 1224 is a wax or an amine; the density of the film layer 122 is smaller than 1; and the thickness of the film layer 122 is between 0.17 millimeters (mm) and 2.0 mm.

When making the film layer 122, the following steps are included:

Step (a): Please refer to FIG. 3, which is a view showing step (a) for making the film layer. As shown in the figure, a 45% of SEBS block copolymer 1221 of G1651 by KRATON Polymers, a 40% of POE 1222 of DF110 by Mitsul Elastomers Singapore, a 15% of EVA of UE629 by USI Corporation, and a slip agent are well mixed to obtain a fluid-type material 122 a by a slicing force though twin screws 31 of a mixer 3 under 180˜250 Celsius degrees (° C.). Furthermore, when mixing the material of the film layer 122 in the mixer 3, a required pigment can be added for the film layer 122 to obtain a required color.

Step (b): Please refer to FIG. 4, which is a view showing step (b). As shown in the figure, after the mixing, the fluid-type material 122 a is extruded with twin screws 41 of an extruder 4 under 180° C. to obtain a pellet-type material 122 b.

Step (c): Please refer to FIG. 5, which is a view showing step (c). As shown in the figure, the pellet-type material 122 b is extruded by a T-die 5 to obtain a raw material 122 c.

Step (d): Please refer to FIG. 6, which is a view showing step (d). As shown in the figure, a film layer 122 is obtained from the raw material 122 c through a two rolls mill 6, where the film layer 122 has a density smaller than 1 and a thickness between 0.17 mm and 2.0 mm.

For testing the film layer 122 obtained, the film layer 122 is shone by an ultraviolet light of 300 watts under 50° C. for 24 hours with a distance of 25 centimeters. Then, the film layer 122 is taken to be compared with standard color swatches of ASTM-D1148, where a discoloration degree of 4˜5 is found for the film layer 122 and so its function of discoloration is confirmed.

Please refer to FIG. 7, which is a view showing a first structure of the shoe upper. As shown in the figure, a film layer 122 is covered on a leather layer 121; and, through a high frequency waving 7, the film layer 122 and the leather layer 121 are adhered together to obtain a material for a shoe upper 12.

Please refer to FIG. 8, which is a view showing a second structure of the shoe upper. As shown in the figure, a material for a second structure of a shoe upper 12 a is obtained by inserting a figure layer 123 between a leather layer 121 and a film layer 122. Through a high frequency waving 7, the film layer 122, the figure layer 123 and the leather layer 121 are adhered together and do a variety of footwear is obtained.

To sum up, the present invention is a footwear having a non-yellowing film, where a shoe upper of a footwear obtains a discoloration through a film layer.

The preferred embodiment herein disclosed is not intended to unnecessarily limit the scope of the invention. Therefore, simple modifications or variations belonging to the equivalent of the scope of the claims and the instructions disclosed herein for a patent are all within the scope of the present invention. 

1. A footwear having a non-yellowing film, comprising a shoe sole and a shoe upper deposed on said shoe sole, wherein said shoe upper is obtained by adhering a leather layer and a film layer through a high frequency waving; wherein said leather layer is made of a material selected from a group consisting of an artificial leather and a fabric; and wherein said film layer is obtained by mixing ingredients of a Styrene-Ethylene/Butylene-Styrene (SEBS) block copolymer, a Polyolefin Elastomer (POE), an Ethylene-Vinyl Acetate (EVA) and a slip agent.
 2. The footwear according to claim 1 wherein, in said film layer, said SEBS block copolymer, said POE and said EVA have ratios of 5 to 50 percent (5˜50%), 30˜80% and 5˜15% respectively.
 3. The footwear according to claim 1 wherein said slip agent is selected from a group consisting of a wax and an amine.
 4. The footwear according to claim 1, wherein said ingredients are well mixed to obtain a fluid-type material; wherein, by using an extruder having twin screws, said fluid-type material is extruded under 180 Celsius degrees (° C.) to obtain a pellet-type material; wherein said pellet-type material is extruded by a T-die to obtain a raw material; and wherein said film layer is obtained with said raw material through two rolls mill.
 5. The footwear according to claim 1, wherein said film layer has a density smaller than
 1. 6. The footwear according to claim 1 wherein said film layer has a thickness between 0.17 and 2.0 millimeter (mm).
 7. The footwear according to claim 1 wherein a pigment is added when mixing said ingredients of said film layer.
 8. A footwear having a non-yellowing film, said footwear comprising a shoe sole and a shoe upper deposed on said shoe sole, wherein said shoe upper is obtained by adhering a leather layer, a figure layer and a film layer through a high frequency waving; wherein said leather layer is made of a material selected from a group consisting of an artificial leather and a fabric; and wherein said film layer is obtained by mixing ingredients of a SEBS block copolymer, a POE, an EVA and a slip agent.
 9. The footwear according to claim 8, wherein, in said film layer, said SEBS block copolymer, said POE and said EVA have ratios of 5˜50%, 30˜80%, 5˜15% respectively.
 10. The footwear according to claim 8, wherein said slip agent is selected from a group consisting of a wax and an amine.
 11. The footwear according to claim 8, wherein said ingredients are well mixed to obtain a fluid-type material; wherein, by using an extruder having twin screws, said fluid-type material is extruded under 180° C. to obtain a pellet-type material; wherein said pellet-type material is extruded by a T-die to obtain a raw material; and wherein said film layer is obtained with said raw material through two rolls mill.
 12. The footwear according to claim 8, wherein said film layer has a density smaller than
 1. 13. The footwear according to claim 8, wherein said film layer has a thickness of 0.17˜2.0 mm.
 14. The footwear according to claim 8, wherein a pigment is added when mixing said ingredients of said film layer. 